The blue-grey rooftops of Paris get their coloration from zinc panels that were initially set up inside the 1830s. trailer (Specifically British English) a number of small scenes from a film or television programme, proven beforehand to advertise it.Patterns plural commercials Britannica Dictionary definition of COMMERCIAL [rely] : an advertisement https://webchewy.com/finding-the-right-commercial-roofing-services-in-chicago-expert-tips-for-business-owners/